32b vs 64b

I see that firmware is provided in both 32bit and 64bit eos formats. I assume the underlying linux is 64bit. Then the question is what is the reason for having both eos options? I read that it’s beneficial on the 7280R line that using 64b provides better performance with multiple full bgp tables. If 64bit performs better then why even offer 32bit? Are there disadvantages of running 64bit eos on the 7280R product line?

Starting EOS-4.22.0F, 64-bit EOS image is available on select platforms with 32G memory for special use cases, or for running custom 64-bit applications.

Customers can continue using the standard 32-bit version of EOS image as before. The use of this 64-bit image on a lower memory profile platforms is not recommended as it may result in undesirable behaviour.

I'd suggest getting in touch with your local Arista SE who should be able to help discussing the more appropriate choice according to your environment.

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